Gebでページ操作を定義する ref: http://qiita.com/items/a8164a5f2eb7249a8e97

file0.txt

class ExamplePage extends Page {
  static content = {
    userId { $("form").find("input", name: "userId") }
    userIdErr { $("span#userIdErr").text() }
  }
}

file1.txt

class SearchPage extends Page {
  static content = {
    searchUser { key -> 
      $("#searchForm").find("input", name: "keyword").value(key)
      $("#searchButton").click()
    }
  }
}